is there a vender comparison chart available?

I have recently completed 28 volumes on guitar scales. 

Currently I am evaluating vendor solutions for eBook distribution.

Has anybody created a comparison chart for the following vendors:
- 1shoppincart.com
- payloadz.com
- ejunkie.com
- ebookmall.com
- booklocker.com
- lulu.com
- Lightning

Is there a general consensus on which vender is "the best" for eBooks?

Thanks,
---Freddy



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